More on that mysterious suspect -- -- a fellow students and roommates are now speaking out. And so was the police chief who took that call from the suspect's family shortly after the shootings here's ABC's -- -- -- -- -- -- -- tonight. Tonight that burning question why would a 23 year old who was once a French horn player in the school band. Allegedly go on a shooting Rampage at LA -- Clues may lie in his past. -- -- announced -- graduated from the small private Delaware high school in 2008. Former classmates call him an inch over a loner. He was like a shy guy he always kept himself -- -- always walking around by himself. And didn't really talk to anybody at all other classmates have said -- -- -- was bullied his life was a secret everybody in our senior class talked. There were few people that captain felt -- -- -- -- one of -- a family friend tells the LA times. -- -- his mother died in 2009. After years battling multiple sclerosis. Her death the friend says was tough on the kids see on -- ended up moving to Los Angeles living in this apartment complex. His roommate says he's shocked. If any might have any issues with -- it was really nice guy a bit loner introverted but nothing that. I would ever ever expecting news. The -- was reportedly an unemployed motorcycle mechanic. And moved out of the apartment in February city's collective years ago work -- in making amends with family problems that whatever you know and spending -- -- Tonight a New Jersey police chief tells ABC news. Beyond his -- -- called him just as journalists learned of his son's alleged role. But he called the incident. AJ that this might -- I'm seeing on TV. -- that the shooting at the airport but says Paul I don't know I just heard from -- reporter. And at the scene of that shooting police -- on still left. Behind a note showing he was ready to die in that shootout investigators say -- -- just sent his brother a text message before the shooting. Talking about possible suicide. As a so often the case now we're turning the warning sometimes -- things.

This transcript has been automatically generated and may not be 100% accurate.

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